Patch for rubber articles.



J. G. MOOMY.

PATCH FOR RUBBER ARTICLES.

APPLICATION FILED MAR. 26, 1 12.

Patented July 29, 1913.

ANT no.

JOSEPH G. MOOMY, EBE, PENNSYLVANIA.

PATCH FOR RUBBER ARTICLES.

aser.

Specification of Letters Patent.

Patented an as, rare.

Application filed March 26, 1912. Serial No. 686,282.

- ber articles and consists in certain improvea an enlarged cross section through the mate-- any Waste of material, and therefore, this ments in the construction thereof as will be hereinafter fully described and pointed out in the claim. The invention is illustrated in the accompanying drawings as follows Figure 1 shows a view of a series of patches in the process of manufacture. Fig. 2 a plan view of the finished patch. Fig. 3

rial forming thepatch.

on which the patches are arranged. In the manufacture of the patches, the rubber portion 1 is preferably formed round as shown, and these portions are laid on a muslin backing as indicated in Fig. 1. The muslin is then cut at the dashed lines 3 and thus forms the patchshown in Fig. 2. In the use of these patches, ,the muslin portion 5 is removed. By leaving the muslin square or rectangular with the rubber portion round or of a different shape than the muslin corners as 5 will be left to facilitate the separa-. tion of the muslin from the rubber when itis desired to use the patch. This flap or extension of the muslin is obtained without desirable feature is accomplished without additional expense. In fact, in some respects the cuttin oft-he 'muslin in straight lines is simpler t an trimming it to the size of the rubber.

. The contact face of the rubber patch -1n 1 marks the patch, 2 a backing of' muslin ping of the patches prior to their application. The layer of raw rubber has heretofore been secured to the layer of vulcanized rubber by the use of cement or cold process solutions, the raw rubber being united with the vulcanized rubber after the vulcanization of the vulcanized layer. Benzin or some similar fluid is usually applied to the surfaces so as to soften the rubber and facilitate the adhesion of the rubber. The

dificulty with patches heretofore made is that this application of benzin or similar material has had the effect of loosening in many instances the layer of raw rubber from the layer of vulcanized rubber. The displacement of the vulcanized rubber exposes the outer surface of the raw rubber so that when used on inner tubes for tires, the tube of the inner layer adheres to the inner surface of the tire shoe and this is objectionable. I obviate the difficulty just hereinbefore by reason of the exposure of the raw rubber mentioned by forming the layer of raw rubber of non-vulcanizingmr-raw stock and placing it in contact with the layer of vulcanizing stock having the usual ingredients to effect the vulcanization and vulcanizing the vulcanizing layer in contact with the layer of-raw rubber. The vulcanizing compound of the vulcanizing layer penetrates the contacting surface of the layer of raw rubber slightly so that there is a complete union between the'layer of raw rubber and the layer of vulcanizing stock as the layers are vulcanized. On the other hand, the vulcanizing material. does not penetrate the layer of raw rubber sufficiently to impair the adhesive efficiency of the outer surface of the layer of raw rubber.

What I claim as new is A patch for rubber articleshaving one surface raw rubber and the opposite surface order to adhere readily to the article bein patched is ordinarily formed of raw rubber raw rubber, and a layer of vulcanizing-stock*=" or rubber that is not vulcanized. Rubber united by and during-the vulcanization of in this condition adheres niuch more readily the vulcanizing stock; than a vulcanized rubber. Heretofore, In testimony whereof I have hereunto set patches of this kind have been made by my hand in the presence of two subscribing g vulcanized rubber and formed of a layer of;-

forming a layer of vulcanized rubber as 6 and then placing onthis a layer ofraw rubber or nonfvulcanized rubber 7. The

muslin 2 is placed on the face of the raw rubber to facilitate the'handling and ship- B. M. HABTMAN, THOMAS C. Mme. 

